I have very little information thus far and would like some general understanding to prepare for site visit in a couple of days.
So we have a machine that lifts a container (load) up and down about feet. The weight doesn't change much.
The machine is very basic, 3HP motor, gear box, reversing motor starter and a braking resistor. There's a circuit breaker supplying the machine with 600VAC located about 20' before the machine. There's no drive and it's a simple one speed up and down operation.
On commissioning the machine the technician reported that the machine lifts up the load with no problem at all but lowering form any position will immediately trip the breaker not the overload. We will have an electrician on site when I go there in case the breaker needs to be replaced.
I would like to understand how the generated current affects the circuit. Let's assume there's no resistor at all would the breaker trip first or the overload? (assume both are sized and working properly).
Thanks
So we have a machine that lifts a container (load) up and down about feet. The weight doesn't change much.
The machine is very basic, 3HP motor, gear box, reversing motor starter and a braking resistor. There's a circuit breaker supplying the machine with 600VAC located about 20' before the machine. There's no drive and it's a simple one speed up and down operation.
On commissioning the machine the technician reported that the machine lifts up the load with no problem at all but lowering form any position will immediately trip the breaker not the overload. We will have an electrician on site when I go there in case the breaker needs to be replaced.
I would like to understand how the generated current affects the circuit. Let's assume there's no resistor at all would the breaker trip first or the overload? (assume both are sized and working properly).
Thanks